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A Solid-State 1 NMR and Theoretical Study of the Chemical

Summary: A Solid-State 1
NMR and Theoretical Study of the Chemical
Bonding in Disilenes
Robert West,*,1a Jefferson D. Cavalieri,1a Jarrod J. Buffy,1a Charles Fry,1a
Kurt W. Zilm,1b James C. Duchamp,1b Mitsuo Kira,1c Takeaki Iwamoto,1c
Thomas Mu1ller,1d and Yitzhak Apeloig1e
Contribution from the Department of Chemistry, UniVersity of Wisconsin,
Madison, Wisconsin 53706, Yale UniVersity, New HaVen, Connecticut, Tohoku UniVersity,
Sendai, Japan, Humboldt UniVersity, Berlin, Germany, and Technion-Israel Institute of
Technology, Haifa 32000, Israel
ReceiVed NoVember 12, 1996X
Abstract: Nine disilenes have been studied by solid-state NMR spectroscopy, under static or slow magic-angle spinning
conditions, to determine the 29Si chemical shift tensors. All of the compounds show strong deshielding along one
axis and correspondingly large spreads of the tensor components, ()11 - 33). MO calculations on model
disilenes indicate that the deshielding results from a paramagnetic contribution along the in-plane axis perpendicular
to the Si-Si vector. lmplications of the NMR data and the theoretical camputations for SidSi bonding are discussed.
1. Introduction
The chemistry of multiply-bonded heavier main group
elements has been actively investigated in recent years.2,3 The
nature of the bonding in such low-coordinate compounds is of


Source: Apeloig, Yitzhak - Department of Chemistry, Technion, Israel Institute of Technology


Collections: Chemistry